Studio 2019 activation problem

Hello,

I have upgraded my FL+ license key to Studio 2021 and I was able to use both 2021 and 2019 side by side.

Yesterday, I had to make a fresh Windows 10 install. First, I installed 2019. I tried to activate it with my 2021 key, but it didn't work.

Then I installed 2021 and successfully activated it with my key. I launched 2019, thinking it would also get activated, but it didn't.

Then I thought maybe it has got to do with the installation order, so I removed 2019 and reinstalled it. It's still not activated. It's not activated by itself, and it doesn't get activated when I enter my 2021 key.

So now I have 2019 on trial period. I know I should be able to get it activated, because both the 2021 launch e-mail and also my SDL Account's Licenses page states so.

I have the latest version of 2019 installed (CU7), so that's not the problem.

Thanks in advance!