All subgraphs on The Graph’s hosted service will not be queryable for up to 30-60 minutes. The 30-60 minute downtime will begin within a six-hour time window (08:00-14:00 UTC).

See the status here.

During this downtime, most vesting balances won't be showing correctly. In case you want to claim certain tokens, you can interact with the claim method directly with the contract using the blockexplorer (Etherscan, Arbiscan, Polygonscan, Bscscan, etc.)