Originally Posted by Vein 666
Just got Tonya's last mission to pull up using a method from R* support. So here it is for other's that may have the same problem.
- Try connecting to GTA Online in Solo Mode, and immediately after getting in, return to Story Mode, or saving to another slot in GTA Online and then returning to Story Mode.
Worked for me.
You total legend, this works. the 'last one' would not appear having messed around with 100% status (UFOS, submarine searching, getting the jet from the fort... etc) for like days (real-life ones). Tried your trick and bang, the '?' appeared.