Solved

Changes to selling driver ??

Im not in a league currently, if that makes a difference here.
I have 2 drivers and tried to Sell/Auction one of them, however the option is greyed out and states "You have the min. allowed number of drivers. Hire more first"

Never been an issue for me in the past.

I think the game interprets “not being in a league” as “being in a two car league”.
So you have the minimum number of drivers to race at 2, hence it won’t let you sell.

Thanks Ross, I had noticed that neither of them were listed on the bottom half of the page under "Reserve" both are "Active Drivers", so you've confirmed my thinkings, cheers