Salesforce Survey getting "Page Not Found: /aura error message when sending a Survey to participants outside your company."

If you see an error like "Page Not Found: /aura" error message for community-based external survey invitations:

You probably are missing the required Survey Objects permission for your community guest user.

To Fix this :

1. From Setup, enter Survey in the Quick Find box, then select Survey Settings.
2. Check which community is selected as the default community to create public survey invitations.
3. Enter Communities in the Quick Find box, then select All Communities.
4. Open Experience Builder of the default community.
5. From Experience Builder, click , and select General.
6. Click the profile name under Guest User Profile.
7. Click Edit.
8. In the Standard Object Permissions section, give guest users the following permissions:

1. OBJECT	2.PERMISSIONS
   Survey	Read
   Survey Invitations	Read
   Survey Responses	Read AND Create

9. Click Save.