Store user information reliably

[TechPhil]

Forgive me if this is not the best place to ask, but I am completely stumped here.

I am using this module for authentication with Azure Active Directory via Oauth2.

After the user logs in, I need to use the access token to access the Microsoft Graph API to retrieve a list of groups the user is part of. This list of groups needs to be reliably available in a middleware function, as well as in pages themselves.

What is the best way to go about this? I have tried a few methods, but it seems as though the list gets wiped or just not loaded in soon enough, especially on a hard page reload.

TIA for any assistance :)