I need to generate a HubSpot API key so we can plug it into our new CRM, One Mortgage System (OMS). We plan to use the HubSpot Starter tier for our marketing function. To generate this key, I have been directed by OMS to follow the “Create Legacy App” instructions, and from there, copy the access token. I’ve followed everything as instructed, but I keep coming across this error. HubSpot Error.gif Any help here to fix this would be great. Thanks

Hi @MerryMarketing, For your use case, I recommend using Service Keys instead of the Legacy Apps Make API requests using a service key (BETA) - HubSpot docs Learn about how to use a service key to streamline access to data in your HubSpot account. Hope this helps! Moderator note: While this solution may not address the original poster’s specific situation, it could be helpful for other community members facing similar challenges.

Hi Elvadas, Thanks for your response. I have tried Service Keys and that too has the same issue. Please have a look at what happens. https://merryoaks-my.sharepoint.com/:i:/p/marketing/IQByY0eypoD2TpMDKKZgZCWWAdX5gALjX6rOaRFYRTkY52A?e=n9ILd1 It would be great to get a solution for this. We do plan on moving our tier to the paid version, but ideally, we’d need this sorted out first so we can work more productively. Many thanks :blush:

Hi @MerryMarketing, Thank you for sharing the recording. It is strange. You should still be able to use it on a free plan. Can you look into the HAR file to see if get more details about the error? [image] Collect a HAR file for troubleshooting Learn how to record a HAR file and trace in various browsers to help HubSpot support diagnose technical issues effectively.

Hi there, I’ve created the HAR file. Please find it here: HAR File HubSpot Error.har Hopefully this helps. Looking forward to your response.

Hey @MerryMarketing, Thanks for sharing the HAR file. The error showing INTERNAL_ERROR with shouldRetry: false can sometimes point to a portal-level permissions or account configuration issue rather than something on your end. If you’re following the steps from @evaldas, are you able to confirm your portal is enrolled in this beta here? Additionally, are you able to confirm if you’re an Admin in the portal? Thanks for your help so far, @evaldas! Best, Sam

Hi SamTassey, thanks for stepping in. Yes, the portal is enrolled in the beta. And yes, I am the admin. [Screenshot 2026-05-29 210706.png] Beta [Screenshot 2026-05-19 151157.png] Super Admin

Hi both @evaldas @SamTassey I have confirmed that the portal is enrolled in the beta and I am the admin. Could you provide the next steps? Kind regards

Hey @MerryMarketing, Thanks for your response -- would you mind DM’ing me your Portal ID so we can take a further look into this? Looking forward to your response! Best, Sam, Community Manager

Hello @MerryMarketing, I’ve DM’d you again with a few follow up steps. I’ve also provided my email that you can reach out to while our Community goes into Read-Only mode as seen here. Looking forward to your response! Sam, Community Manager

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MerryMarketing June 4, 2026, 8:51am 10

Hi @SamTassey,

I DM’d you the ID portal, but I haven’t received any response unfortunately. Would you be able to have a look at it please?

Thanks

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