Hello Mbasis,
If you are trying to invite someone to share control of your home, please be sure to review all of the information outlined in the following link, to ensure the correct process is being used, so we can make sure there's no issue there: Share control of your home
"Invite someone to control your home
If Home has been upgraded to the new Home architecture, you must set up a home hub to share control of your home.
To invite someone to control your home, follow these steps:
- Open the Home app on your iPhone, iPad, or Mac.
- Tap or click the More button
, then select Home Settings. If you have multiple homes set up, choose the Home that you want to invite someone to, then select Home Settings. - Tap or click Invite People.

4. Enter the person's Apple ID that they use with iCloud.
5. Tap or click Send Invite.
Find out what to do if you can't invite someone to control your home."
If the information in the above link, and the "If you can't access a home or accept an invitation in the Home app" link you mentioned don't help, please contact Apple Support for further assistance. You may be able to reach them here: Contact Apple Support
Thanks!