Hi @ericasun! That “refused to connect” error in the embedded app iframe often comes down to the app URL redirecting when it shouldn’t be. When using managed installation, your app URL endpoint needs to respond with HTTP 200 and render the app HTML with App Bridge directly, not redirect through an OAuth flow. Leftover redirect logic from a legacy install flow is the most common cause of this. A similar issue was discussed here.
To help narrow it down, a few questions:
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Is this happening on all stores or just specific ones?
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Is it intermittent (works on retry) or consistent?
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What does the Network tab in your browser dev tools show when the error appears? Any redirects or specific errors?
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Are you using managed installation or the legacy OAuth install flow?