Hi @nv-ju,
Thank you for reaching out to the Community!
First, I’d like to share this article “Resolve a ‘Request for Integration Permissions’ error” that might be of interest to you.
Also, these similar threads might help you:
- The solution from @IsaacTakushi on this post “OAuth issue requiring superadmin”
- This similar thread “403 user does not have permissions to authorize scopes”
- This similar thread “OAuth2 error - you do not have correct role to grant these permissions”
I’d like to invite a couple of subject matter experts to this conversation: Hi @miljkovicmisa, @deepikaverma and @louischausse do you have suggestions to help @nv-ju, please?
Also, if anybody else has anything to add and/or share, please feel free to join in the conversation 
Thanks so much and have a brilliant day!
Best,
Bérangère