Fix regex pattern syntax in MsalAuth multi-tenant authority resolution#310
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MattB-msft merged 1 commit intousers/mbarbour/supportMultiTenantMultiInstanceAgentIdfrom Feb 5, 2026
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[WIP] Fix MsalAuth multi-tenant support and formatting issues
Fix regex pattern syntax in MsalAuth multi-tenant authority resolution
Feb 5, 2026
MattB-msft
merged commit dcffd84
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users/mbarbour/supportMultiTenantMultiInstanceAgentId
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The regex pattern in
_resolve_authorityused incorrect delimiter syntax (/pattern/) incompatible with Python'sre.sub().Changes
msal_auth.py:167r"/\/(?:common|[UUID-pattern])(?=\/|$)/"r"/(?:common|[UUID-pattern])(?=/|$)"_resolve_authorityand_resolve_tenant_idmethods to verify multi-tenant URL transformationThe pattern now correctly matches and replaces
/commonor tenant GUIDs in authority URLs likehttps://login.microsoftonline.com/commonwith specific tenant IDs.💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.