Hi @Rahul Singh ,
Thanks for reaching out.
I tried to add user to group in Azure AD with GroupMember.ReadWrite.All scope in access token and able to add the user successfully.
Make sure to decode the token using jwt.ms to check the right scopes in the token.
However, the error "403 - Forbidden username/password combo" you are getting seems to be from the Service Now.
Refer the links with same error: https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB0720934
https://www.jotform.com/answers/4221281-api-call-from-servicenow-returns-error-code-403-forbidden-username-password-combo
Hope this will help.
Thanks,
Shweta
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