Hi @GerardLakke, I was in a very similar position to you, hamstringing OneDrive isn't a reasonable option for me.
I contacted MS Store via Chat support and requested a refund, stating I'd tried the support channel here with no official help offered, stating that the SW is in-operable and requested a refund which they did process for me.
I had initially contacted the Affinity Refund email and they directed me to MS Store so do press your case with them.
Good luck, this may be something deep in Microsoft's code but I personally am having no issues with any other applciation I use and Adobe Illustrator and Photoshop are running fine so I'm forced to use them for the time being.