Hi, Jurgen93!
Welcome to Microsoft Community and thank you for sharing your concern with us today.
I understand from your message that Microsoft remote desktop app on mac, problems with HP printer.
We are here to help on this issue.
The problem stems from Apple's recent revocation of digital certificates installed on HP printers through XProtect. XProtect is a feature through which Apple can prevent Mac devices from running certain applications that it no longer considers trustworthy. It can be said that XProtect is Apple's security system for identifying and disabling malware on Mac.
Subsequently, an HP spokesperson said: "We inadvertently cancelled the credentials of some older Mac drivers." "This caused a temporary interruption to these customers. We are working with Apple to restore the drivers. At the same time, we recommend that you encounter this. The user in question uninstalled the HP driver and used the native AirPrint driver to print."
It is recommended that you contact the HP manufacturer to help you solve your printer’s problems.
I hope the information provided is useful to you.
If you have any additional questions, please do not hesitate to reach out to our support.
Best Regards
Rebecca | Microsoft Community Support Specialist