The users are facing below unauthorised error in form submission.

However, in SA the form submission works fine

The user using new UI and was facing error in form submission.
SA is using old UI and no errors faced in form submission.
Reason:
If User is not authorised to update Lead Fields (due to Permission template or due to being a non-owner, etc.,)
- In old UI, Form will get submitted and only Fields which User is authorised to update will get updated.
- In new UI, Form will not get submitted and says ‘You are not authorised to update this record’.
Solution:
Grant user the permissions to update all fields added in the form.
or
Remove the restricted fields from the form or make them read only.
Grant user the permissions to update all fields added in the form.
or
Remove the restricted fields from the form or make them read only.
