Hey @covt,
It's been 2 months since this post. I hope you've been able to figure it out since.
For anyone else with this issue I'd recommend this, which worked for me:
Remove Old Certificates:
Open Xcode.
Go to Xcode > Preferences > Accounts.
Select your Apple ID and click on Manage Certificates.
Right-click on any iOS Development certificates and choose Revoke. This will remove old certificates.
Add a new certificate:
Still in the manage certificates section, add a new certificate using the "+" in the bottom-left corner.
Xcode will automatically create a new certificate.
Hope this helps, good luck!