Really?!

I have mastered Black Widow to Six Red stars to advance her to Tier 2 but it dont work! I have a Tier-2 Advancement Ticket and I pressed the "Advance with Tier-2 Advancement Ticket" button to advance and then a message popped up saying "No Advancement Tickets available."! So I checked my inventory and I saw a Tier-2 Advancement Ticket so I pressed the "Use" button and then another message popped up saying "No character can use this."! This is absurd! Please fix!

Heudhdbdofn about MARVEL Future Fight, v3.1.0