Hi @Morten Østerlund Jørgensen , I may have a solution for you, but if this doesn't work we'll need to open up a support ticket. A user was having a similar issue here. Please set
forceChangePasswordNextLogin to false if you have not done so, and hopefully this will fix your issue. If not please let me know and I can escalate this.
If this answer helped you please mark it as "Verified" so other users may reference it.