App breaks when I connect Fireblocks

We are an EVM dapp developer on Plume, where we use connect kit as our wallet modal provider. Recently we have had a partner say that when they connect their fireblocks wallet, the app breaks and they see this error message

.

We are now trying to debug, but we can’t reproduce this error since we are not able to connect to our own app using Sandbox, as we see this other error on our mobile app when connecting via Sandbox.

Has anyone seen this error where app breaks so? And if not, can someone help us connect to the app with a sandbox account so can debug? Thanks!