How to move user external authentication please help

service A : Django jwt authentication system with graphene, praphql open source.
service B : using django.contrib.auth system & using related table with “auth user model”.

I have to move B authentication system to A for make single sign on system and usertable also use
with service A.

I tried to find reference about this work, but I can’t find it

Can you guys have reference for this work?

Please I need your help.