Can't use 5* champs in T4 arena

Team_Sly

Is any one else experiencing this won't let me use my 5* champs in t4 arena when I got to choose them I keep getting this error, 4* and 3* work fine just not 5*

I_ZERO_I

Try checking after that if they are really ready. They have been showing ready when they really aren't.

Team_Sly

Thanks for the advice guys working again