How to keep connected my Apple 3 watch following the Advanced Data Protection for iCloud settings

With IOS 16.3 came the Advanced Data Protection for iCloud.

So I set it. However, during the process, it was said my apple watch 3 was not meeting the requirements for this level of cloud data security and it had to be disconnected from the list of my devices.

Ok. I complied.

Surprisingly, my watch is still sending my activities recording to the Fitness app on my iPhone 12pro...

First question: What is this level of disconnection? I am really confused.

But the most annoying remains on the incessant request from the watch to be reconnected to its previous Appel ID.

Second question: How can I get rid of the request?

I was thinking about the opportunity to connect to another apple ID. I have 2 on my iPhone (for emails mainly).

Third question: Is that possible? and what about the Fitness and Health app to receive inputs from the watch though a different ID?

Thanks in advance for your answer.