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Not really much to go on... 
How about adding some additional details, please. 
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Sorry about that. This format tends to overwhelm my tablet.
I have just migrated from C7 to C8 Pro using my latest backup. All my devices and app/rules show correctly in the new Hub but I am unable to activate any device. Nothing complicated, just switches and lights. Something very basic is missing. I have connected to Wifi and set the speed to Auto, The new Hub is in the same location as the old was. Suggestions welcome.
Thanks
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Are the uncontrollable devices Z-Wave? Zigbee? Or LAN/WiFi?
My guess is that they are Z-Wave, based on other recent similar reports post migration.
Tagging @support_team as I really do not know what the recommended solution is for this specific scenario.
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Did you use a local backup, or the specific migration tool?
A few of the older devices are Z-wave, the others are Zigbee. The backup was from the last cloud system regular backup. Radio issue maybe?
Did you do step 5 and 6 in the instructions here How to Migrate to a New Hub | Hubitat Documentation specifically
- On the new hub, select the Migrating from another hub? link
- And (ensure Migration-ready backups is selected from the Show dropdown), then select the "migrate from another hub" icon
If you just did a normal cloud backup/restore, I don't think the process will work correctly.
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What is your power source? PoE splitter, OE supply or other supply?
Also, check the z-wave details page, do your devices show there?
Have you tried shutting the hub down and unplugging for 30 seconds (to restart the radios)?
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Creating and using the correct C8 backup from the C7 solved the problem . My error.
Everything working fine on the C8 Pro.
Thanks everyone for the help.
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