invalid_tenant when exchanging Auth Code

[SitterIT]

Have en web app like this:

SitterIT_0-1740135554254.png

Pasting in the grant url into the browser:

SitterIT_1-1740135665455.png

And get the auth page up: 

SitterIT_2-1740135779244.png
I also receive the auth code:

SitterIT_3-1740135945990.png

But when doing the POST https://connect.visma.com/connect/token I get error 400 - invalid_tenant

SitterIT_4-1740136112587.png

Looking in the dev portal, no customer has been added.

SitterIT_5-1740136361862.png

I've also tried with different users, all having the Integration Admin setting in 

[SitterIT · Accepted solution]

found out of it. user also need to have api_user also.