diff --git a/lib/rules/template-require-form-method.js b/lib/rules/template-require-form-method.js
index 66be830ca5..ae1f2eed46 100644
--- a/lib/rules/template-require-form-method.js
+++ b/lib/rules/template-require-form-method.js
@@ -7,11 +7,11 @@ const DEFAULT_CONFIG = {
 };
 
 function parseConfig(config) {
-  if (config === false || config === undefined) {
+  if (config === false) {
     return false;
   }
 
-  if (config === true) {
+  if (config === true || config === undefined) {
     return DEFAULT_CONFIG;
   }
 
@@ -26,7 +26,13 @@ function parseConfig(config) {
     }
   }
 
-  return false;
+  throw new Error(
+    'template-require-form-method: invalid configuration. Expected one of:\n' +
+      '  * boolean - `true` to enable / `false` to disable\n' +
+      '  * object -- An object with the following keys:\n' +
+      `    * \`allowedMethods\` -- An array of allowed form \`method\` attribute values of \`${VALID_FORM_METHODS}\`\n` +
+      `Received: ${JSON.stringify(config)}`
+  );
 }
 
 function makeErrorMessage(methods) {
@@ -51,12 +57,16 @@ module.exports = {
     schema: [
       {
         oneOf: [
+          { type: 'boolean' },
           {
             type: 'object',
             properties: {
               allowedMethods: {
                 type: 'array',
                 items: {
+                  // Accept any string so case-insensitive values like "get"
+                  // still pass schema validation; parseConfig normalizes to
+                  // upper-case and throws on values not in VALID_FORM_METHODS.
                   type: 'string',
                 },
               },
@@ -78,9 +88,10 @@ module.exports = {
   },
 
   create(context) {
-    // If no options provided, use defaults
-    let config = context.options[0];
-    config = config ? parseConfig(config) : DEFAULT_CONFIG;
+    // Default-enabled: parseConfig(undefined) returns DEFAULT_CONFIG.
+    // Pass `false` to explicitly disable the rule.
+    const rawOption = context.options[0];
+    const config = parseConfig(rawOption);
 
     if (config === false) {
       return {};
diff --git a/tests/lib/rules/template-require-form-method.js b/tests/lib/rules/template-require-form-method.js
index 5e3573b565..779519422a 100644
--- a/tests/lib/rules/template-require-form-method.js
+++ b/tests/lib/rules/template-require-form-method.js
@@ -9,6 +9,7 @@ const validHbs = [
     options: [{ allowedMethods: ['get'] }],
     code: '<form method="GET"></form>',
   },
+  // No options → default-enabled with POST,GET,DIALOG.
   '<form method="POST"></form>',
   '<form method="post"></form>',
   '<form method="GET"></form>',
@@ -20,9 +21,24 @@ const validHbs = [
   '<div/>',
   '<div></div>',
   '<div method="randomType"></div>',
+  // Explicit `true` behaves identically to no options.
+  { options: [true], code: '<form method="POST"></form>' },
+  // Explicit `false` disables the rule.
+  { options: [false], code: '<form></form>' },
 ];
 
 const invalidHbs = [
+  // Default-enabled: no options → rule active with POST,GET,DIALOG.
+  {
+    code: '<form></form>',
+    output: '<form method="POST"></form>',
+    errors: [{ message: DEFAULT_ERROR }],
+  },
+  {
+    code: '<form method="NOT_A_VALID_METHOD"></form>',
+    output: '<form method="POST"></form>',
+    errors: [{ message: DEFAULT_ERROR }],
+  },
   {
     options: [{ allowedMethods: ['get'] }],
     code: '<form method="POST"></form>',
@@ -40,26 +56,31 @@ const invalidHbs = [
     ],
   },
   {
+    options: [true],
     code: '<form></form>',
     output: '<form method="POST"></form>',
     errors: [{ message: DEFAULT_ERROR }],
   },
   {
+    options: [true],
     code: '<form method=""></form>',
     output: '<form method="POST"></form>',
     errors: [{ message: DEFAULT_ERROR }],
   },
   {
+    options: [true],
     code: '<form method=42></form>',
     output: '<form method="POST"></form>',
     errors: [{ message: DEFAULT_ERROR }],
   },
   {
+    options: [true],
     code: '<form method=" ge t "></form>',
     output: '<form method="POST"></form>',
     errors: [{ message: DEFAULT_ERROR }],
   },
   {
+    options: [true],
     code: '<form method=" pos t "></form>',
     output: '<form method="POST"></form>',
     errors: [{ message: DEFAULT_ERROR }],
@@ -100,3 +121,28 @@ hbsRuleTester.run('template-require-form-method', rule, {
   valid: validHbs,
   invalid: invalidHbs,
 });
+
+// parseConfig should throw on an invalid `allowedMethods` entry so that
+// misconfiguration is surfaced immediately rather than silently ignored.
+describe('template-require-form-method invalid configuration', () => {
+  const { Linter } = require('eslint');
+
+  function lintWith(options) {
+    const linter = new Linter();
+    linter.defineParser('ember-eslint-parser/hbs', require('ember-eslint-parser/hbs'));
+    linter.defineRule('template-require-form-method', rule);
+    return linter.verify('<form method="POST"></form>', {
+      parser: 'ember-eslint-parser/hbs',
+      parserOptions: { ecmaVersion: 2022, sourceType: 'module' },
+      rules: { 'template-require-form-method': ['error', options] },
+    });
+  }
+
+  test('throws on unknown method in allowedMethods', () => {
+    expect(() => lintWith({ allowedMethods: ['PATCH'] })).toThrow(/invalid configuration/);
+  });
+
+  test('throws on mixed valid/invalid method list', () => {
+    expect(() => lintWith({ allowedMethods: ['GET', 'BOGUS'] })).toThrow(/invalid configuration/);
+  });
+});