Custom connector with OAuth2: three auth pitfalls we debugged

May 24, 2026 · 2:51 AM UTC ·6 min read · 0 reactions · 0 comments · 22 views

#oauth2 #powerautomate #customconnectors

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The article discusses three common pitfalls encountered when creating custom connectors using OAuth2 in Power Automate. These issues can lead to significant delays in development and require careful attention to detail. The author provides solutions to each problem to improve the connector setup process.

Key facts

▪The first pitfall involves hardcoding a tenant-specific redirect URL, which can cause failures when moving between environments.
▪The second pitfall relates to refresh token handling, where the absence of a refreshUrl in the connector's configuration leads to unauthorized errors.
▪The third pitfall is the requirement of a custom parameter by the API that is not part of the OAuth2 specification, necessitating additional configuration.

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Original publisher	DEV.to (Top)
Canonical URL	https://dev.to/sapotacorp/custom-connector-with-oauth2-three-auth-pitfalls-we-debugged-4758
Publication time	Sun, 24 May 2026 02:51:34 +0000
Retrieval time	2026-05-24T03:07:29.848Z
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try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3948393) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } SapotaCorp Posted on May 24 • Originally published at sapotacorp.vn on May 24 Custom connector with OAuth2: three auth pitfalls we debugged #powerplatform A client uses a third-party logistics API that is not in Power Automate's built-in connector catalog. The API speaks OAuth2 authorization code flow. The platform has a "Create a custom connector" flow that claims to handle OAuth2 in a couple of clicks. The first two connectors we built this way worked.

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