Creating Custom Connector and using Environment Variables

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Posted on by FH-14040556-0

Hi,

When using an environment variable as host parameter in my custom connector, according to https://learn.microsoft.com/en-us/connectors/custom-connectors/environment-variables,

I get the following error message:

The request failed with client error: 'Invalid Api definition object. Please specify a valid Swagger 2.0 Url and valid list of ServiceUrls.'. The correlation Id is '56b4c4e2-fd75-456f-bc72-91910df8880f'.

It looks like I can't use custom variables. What can I do to resolve the issue?

Best,

Fabian

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Connector development

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Vish WR 892 on at

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@FH-14040556-0

There was a similar question asked. Swagger UI is for definition, not an implementation

Swagger UI does not support path templation, and should be a valid host. Please find the below link for reference

https://spec.openapis.org/oas/v2.0.html?utm_source=chatgpt.com#path-templating

Vishnu WR

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Riyaz_riz11 4,120 Super User 2026 Season 1 on at

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Hi,

Environment variables in custom connectors have limited support.
Try hardcoding the host temporarily to confirm the connector works
Use a workaround through a flow variable instead.

Raise it with Microsoft support if nothing works.

If I have answered your question, please mark it as the preferred solution ✅ . If you like my response, please give it a Thumbs Up 👍.
Regards,
Riyaz

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FH-14040556-0 2 on at

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Hi,

Microsoft documents it is possible to use environment variables in custom connectors: https://learn.microsoft.com/en-us/connectors/custom-connectors/environment-variables

How would I use a flow variable as host for a custom connector?

Regards

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Power Platform Guy 59 on at

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@FH-14040556-0,

What environment variables ARE supported for
Supported:

Base path

Operation path segments

Headers

Query parameters

Request bodies

Authentication parameters

Policy expressions

Not supported:

host

servers[].url

serviceUrl

This limitation applies to:

Swagger 2.0 (host, basePath)

OpenAPI 3.x (servers.url)

I would also suggest you to kindly raise a ticket with Microsoft Support Team to get to know about this issue.

Please ✅ Does this answer your question if my post helped you solve your issue. This will help others find it more readily. It also closes the item.

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