Hey there Civser11,
We'll be happy to help advise regarding your Fitness+ complication.
Have you tried restarting all the affected devices one after the other to see if that helps?
Are all your devices fully updated?
Can you check and make sure that all the devices meet the system requirements to use Fitness+?
Take a look at the steps listed in the article below. If you continue to run into complications, you can reach out to Apple Support directly.
Devices you can use with Apple Fitness+
Work out with Apple Fitness+
Get Support
Warm regards.