Forgot to update the thread, but good news:
Originally Posted by
Zorak
My previous CSR bonus posted on a statement with a closing date of 3/3/2017. PCed the CSR in late 2020 and do not currently hold any other Sapphire cards. I tried applying in-branch for the CSP today and the system wouldn't even let them do it (which they then tried to claim was because it has to be 48 months from account closure, not last bonus

)
a friend fwded me a post from r/churning saying there was a glitch causing some customers to be unable to apply for a CSP in-branch and that it would be fixed April 23. Whether because of that, or...
Originally Posted by
Zorak
so maybe it's not an exact 48 months?
... I have since successfully applied for CSP in-branch, followed by MDD for the CSR.