MPC signing failed for Embedded Wallets (NCW) sandbox environment

I’m integrating Embedded Wallets. Things is working fine so far and I could generate mpc keys and sign transactions.
But suddenly it stops working since yesterday and I could not sign transaction anymore.
I updated the FireblockSdk for ios to the latest (2.9.14) but that doesn’t help either.

Then timeout and failed

Transaction id:
ff0e3499-a2d3-4912-998e-349203442dfe

Source wallet id:
7a871ca2-2c29-420e-a62b-61eaae263255
My sandbox account: thuan@bitwala.com

It worked perfectly fine for me last week so it’s a bit weird. Please help.