Hey Graig, this is usually due to a mismatch in the API key. Here's what I'd recommend:
* In Clay, first navigate to Settings > Account > API key.
* Copy the value there. (Regenerate first, if you like.)
* Navigate to Connections > Clay.
* Edit or replace the existing connection(s) to ensure they use the current key.
Then, just make double-check your table is using the connection you want. Retry the column when all that's done.