Gateway none after take over

Hi!

We have a dataflow and we now want to permanently change the data flow owner. Therefor, we created an PBI_admin account and I want to change the owner of all dataflows to that account.

But, when I take over the dataflow and want to change the credentials fot the data source in the dataflow, the 'data gateway' had dissappeared (is 'none') and no authentication kind of 'Windows' is possible.

I already added the PBI_admin account to the Gateway Administrators.

What happened and how can I solve this issue?

Kind regards,

Bert Dijkstra