I keep getting the same error message of server requires authentication , invalid username or password for server

[Kal_Lam]

@mannu, maybe this post discussed previously should also help you solve your issue:

Authentication problem

Welcome back to the community, @Nour! Have you checked this setting Allow submissions to this form without a username and password from under the FORM tab as shown in the image below? [Image 1] That should help you solve your issue.