Half Marathon Adaptive Plan Creation (Garmin Run Coach) not working

I try to start a new running plan and I would like to use the adaptive plan (the Garmin Run Coach) for the half marathon.

However, I always end up seeing an error screen, showing me that something on your end, on Garmin's end, went wrong and that I can retry.

I've tried it a few times now over the past few days, I deleted the app, reinstalled it, I deleted all previous plans finished and unfinished, I deleted all events, nothing worked.

If I select one of the older plans with a coach like Greg it seems to work. However, I would like to use the adaptive one as it seems to be more interesting and fun to use rather than a standard plan. 

I am using a Garmin Fenix 6s pro with Firmware 28.02.

See Screenshots. 

And in the web app, I cannot chose the same plan, there I can only select the existing coach plans so it is not the same outcome it seems. 

Anything I can do to fix that?