Error: Please provide valid MPN ID and try again(but I copy/pasted it).

If I type in a valid MPN ID, I can understand an error like 'mpn id is valid but you do not have access' or some error that tells me what is REALLY wrong. Instead it says 'please provide a valid MPN ID'. My MPN ID is valid so no idea what next. After all, I would not even have an MPN ID if it was not valid ;) as you cannot get it until you get approved, right?

In partner center, it says 'Active programs' and under that 'Commercial Marketplace' so looks like our partnership is fully verified. I am using the same email in both azure and in partner center when logging in. Is MPN ID a secure number? I did not cut/paste that bellow intentionally. what about seller id, is that secure too so I can't take a pick of my partner center dashboard?

We were trying to do that for sign in clicking this section in azure App Registrations.