I mistakenly deleted my hub.
Since that point I have reset the hub thinking I could just re-add devices. So far that hasn’t worked out.
I’ve added the hub to the app but am unable to add any devices manually or via automatic discovery. Also when I log on the graph.api.smartthings.com website it doesn’t show I have any hubs. When I look in the mobile app it shows I have an active hub. No idea where to go from here.
Any help would be appreciated
Probably for this issue you’ll have to work with SmartThings Support. A search of the forum should turn up a number of folks to have been in the same situation.
EDIT: Ooops! Re-read this. I originally thought you needed to get your hub back! The guys, below, are on the right track… 
If they are zwave devices, you need to exclude them first. If they are zigbee you reset them and re-add them.
Not sure how to exclude them. Please explain
Wrong website.
Always go to https://account.SmartThings.com