If you happened to select the “Update your Home Architecture” option after updating to 16.2 you may have some problems.
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I ran into this problem with family members being removed from the home and not being able to add them back in. I didn’t want to wipe my HomeKit config so I followed the instructions in this link and performed it on all invited phones/iPads and it worked for me.
I didn’t have to perform this on any of my devices.
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When I initially tried to update, the Home app wouldn’t let me since I have a device running a version older than 16.2 somewhere (it wouldn’t tell me what device it was though).
I guess I don’t mind holding off for a bit now.
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Ditto! That’s the only thing that saved me. LOL
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Apple has provided some help but not sure if it will help everyone
So I can finally be happy Apple won’t allow my pre-HomeKit-chip smart devices (which I can control from my iPhone with the individual apps, or from Google Home and Alexa devices) to interact with HomeKit?
Sweet. 
If you’ve upgraded you probably won’t have issues accessing your devices… it seems to only break invitations for other users.