Hello BlinCaps,
Thanks for asking the Apple Support Communities for help with Shortcuts. You are in the correct area: How to enable shared shortcuts on your iPhone, iPad, or iPod touch - Apple Support
Belive the issue is the fact you are using iOS 15 beta.
Thanks for being a Beta Software tester, but until you are running a final release of iOS, the options are to submit feedback using the Apple Beta Software Feedback Assistant, or reverting back to an official version such as iOS 14.7.1
Here is info about the program: Apple Beta Software Program - Apple
Here are answers to the frequently asked questions Apple Beta Software Program - Frequently Asked Questions (FAQ) - Apple
If you want to remove the Beta software, you can use the options in this article: How to uninstall iOS beta software - Apple Support
Thanks and have a wonderful day.