so you wrote it says "tx failed". did you check on polygonscan if the tx was initiated but failed or never even initiated?
because if it was initiated but failed there will be the reason mentioned.
if it never was initiated then i'd try to set gas fee and gas limit manually for like 10x of what was set by default.
I was not prompt to allow or sign any transactions. It just showed that message on their site.
But anyway, after trying to disconnect the wallet... and then login again, I got this error message (something I have never gotten before):

And apparently, this was what was preventing me from unbonding the funds too. Using a VPN helped.