Cant send an invitation to Homekit

Hello Martin_Kolembar,

Let's have have the invited user delete unused homes in the Home app, as this may clear up unexpected behavior with receiving the invite. Check out those steps here:

If you can't access a home or accept an invitation in the Home app - Apple Support

"If you can no longer connect to a home, or receive or accept a home invitation, here’s what to do.

1. On the invited user's iPhone or iPad running iOS or iPadOS version 16.2, open the Home app and tap the More button  to see a list of homes.
2. On the invited user's iPhone or iPad, remove homes that don't have accessories. Tap a home to select it, tap the More button , select Home Settings , scroll down, and tap Remove Home. If the invited user has a home with accessories, contact Apple Support.
3. Restart the invited user's and home owner's iPhone or iPad, and restart all Apple TV and HomePoddevices in the home.
4. On the home owner's iPhone or iPad, open the Home app and remove any pending invitations to the invited user. Tap the More button , select Home Settings , tap the guest's name, and tap Cancel Invitation.
5. Resend the invitation to share control of the home to the invited user.

Make sure the invited user accepts the invitation within 3 hours or the invitation expires. If the invitation expires, complete steps 3-5 again"

Reach out to Apple Support if the issue persists, as they'll be best equipped to further investigate the behavior. You can use the link above to reach out.

Kind regards.