My XC90 is set up as follows.
1 vehicle
1 Volvo ID link to the vehicle.
2 profiles under the same ID
2 phones, each of which belongs to one profile.
2 keys, each of which belongs to one profile.

Now I can check my car's status in Volvo Car app on the two phone.

But I wonder how Volvo ID/Profile/Key/Phone are related.
1. Can I have 1 Volvo ID to manage multiple vehicles? I guess Yes.
2. Can I have 1 vehicle managed by multiple Volvo ID? I guess Yes.
3. Can I have put the 2 profiles under 2 Volvo ID respectively? I guess Yes.
4. Can I have 2 phones under 1 profile? I guess Yes.
5. Can I have 1 phone shared by 2 profiles?
6. Can I have 2 keys under 1 profiles?
7. Can I have 1 key shared by 2 profiles?

From Volvo Cars App FAQ, I see this:
Can you pair more than one mobile device to the Owner profile?
Only one device can be paired to a vehicle profile. All devices paired to a profile after a device is paired to the Owner profile become regular users. You can also make a regular user into an administrator for a vehicle profile.

But this reads contractionary. If only one device can be paired to a profile, why does it says " All devices paired to a profile become regular users" later? Does it mean only one device can be paired to the OWNER profile, while a regular profiles can have multiple devices paired?

Thank you!