Why am I seeing a 'Forbidden' message on draft order payments?

Customers clicking payment button on draft orders are getting blank screen with “Forbidden” message. Anyone else experience this and/or any suggested solutions?

Again, this is only happening on draft orders.

Thx!

Hey, @JPE

Just to confirm where are your customers clicking exactly before they get the ‘Forbidden’ message?

Are they opening up the draft order invoice email > attempt to click on ‘complete your purchase’ > They get error ‘Forbidden’ error?

Are you using any third-party email notification, or order management apps? Such as orderly? Any additional context you can provide would be appreciated.