Unable to configure on-premises data gateway

[HBCCSoft]

I try to configure an on-premises data gateway on my computer.

But when I try to configure the gateway, I get an error message every time. It says nothing more than "Error creating gateway. Try again."

I already turned off the firewall and tried the installation on different computers.

In the Powerapp portal, the error "AADGraphIdentityNotFoundError" is displayed on the gateways page.

Don't I have the right permissions?

I signed up for Power Apps Developer Plan. According to the documentation I should be able to access on‐premises data using an on-premises gateway.

What am I missing? What do I have to do?

Anyone might help me?

Thanks in advance

[HBCCSoft · Accepted solution]

After several teams meetings and phone calls to Microsoft support, I was able to solve the problem this morning.
However, the support's suggested solutions were less helpful than a little luck.
I have installed the on-premises data gateway (personal mode) as a test. This eliminated the "AADGraphIdentityNotFoundError" on the platform. Only then I was able to establish a connection again with the on-premises data gateway.