This looks like the same error I'm getting in my scripts when using remoteFetchAsync. There is a thread here:

https://community.airtable.com/t5/other-questions/remotefetchasync-not-working/td-p/164589

I have the very same failure here! Really need this to be fixed soon.

Hey, getting the same issue using remoteFetchAsync.

Critical issue there.
What's up? 

While we still waiting for Airtable to fix, here is a work around for this issue

Re: remoteFetchAsync not working - Page 2 - Airtable Community

Well at least it's not just me! But really need this fixed, promised a bulk email that can't go out. 

Hi, is there an update? I'm also affected by this.

Confirming also in the same boat. Would be great to get some comms on this.

Looks like Airtable have now solved this one per https://community.airtable.com/t5/other-questions/remotefetchasync-not-working/m-p/164726/highlight/true#M49376

Sendgrid API is still giving an error on our end. Not sure whether it should have been fixed already just as "remotefetchasync"....Getting really anxious now.