"Invalid API key" error on Documents (ApplyDocxTemplate) — intermittent, not a config issue

Documents
1

Hi,

I'm building a document generation flow in Power Automate (called from a Copilot Studio agent) using Plumsail Documents to fill a Word template and generate a contract. I'm getting the same error reported in other threads here:

Invalid API key. Make sure you selected the correct region.

I've already ruled out the usual causes:

  • Generated a new Production-mode API key (confirmed "Production" on the API Keys page) and created a fresh Power Automate connection with it.

  • Confirmed my account has an active trial subscription and plenty of remaining document quota (997/1000).

  • Checked the Process itself (separate from the API key) — it was set to "Testing" mode, I switched it to "Production," but the error still occurs.

  • Also occasionally get a plain "Forbidden" and an "Http502" error on the same action.

This matches what "Maxime" described in the "Power Automate import error every 6-8 tickets" thread — the error appears intermittently (not on every run), and you suggested it could be throttling-related.

Could you check whether this is a rate-limiting issue on your side, or something else? Happy to share my account/process details privately if that helps.

Thanks,
Mustafa

2

Hi @mustafa_aydin ,

The thread you mentioned is related to another of our products - HelpDesk. It's a different product based on SharePoint and has a different architecture.

Regarding the Documents product and the error you're experiencing, please check the Data center location in your Plumsail account:

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You need to use the same Data center location in your Power Automate connection as the one selected in your Plumsail account settings:

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Please check these settings, and if they are different, adjust them so they match. Then give it another try and let me know the result.

You can also find detailed instructions on how to configure and use the Plumsail Documents connector in Power Automate in our article: Use Plumsail Documents in Power Automate.

Best regards,
Aleksandra
Plumsail team