I never was able to run Connect-MgGraph under v4 in PS51 env. error “Invalid JWT access token”
I tested in v5 since it supposed to have less risk of assembly conflicts but I have the same error. work fine in PS7 env.
I had similar issue but when I upgraded to the latest version of Graph, I was able to connect. I do have an open issue to look into assembly conflicts with Az that might be related.