Security Error when confirming email address

I’ve setup and confirmed my domain in both bubble and sendgrid, but for some reason, when a user attempts to confirm their email address via the “create user” workflow, instead of putting my primary app domain as the confirmation link, it puts a subdomain in front of it:

It’s not letting me continue at all for whatever reason, everything is good in sendgrid as far as i can tell:

This post is identical i believe, but it’s been closed without a solution: Invalid certificate when confirming email address

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