This enforcement was originally scheduled for Spring '26 and has moved to Summer '26. Any external system, connected app, or API client using hardcoded Salesforce instance URLs needs to be updated.
Where
All API integrations, connected apps, middleware, and external systems that call Salesforce APIs or webhooks.
How
Audit all API traffic and integration configurations for hardcoded instance URLs (e.g., na1.salesforce.com, eu5.salesforce.com). Replace them with your org's My Domain URL (yourorg.my.salesforce.com). Test all connections in sandbox before production updates.
Why
Salesforce is deprecating static instance URLs in favor of stable My Domain URLs, which persist through instance migrations and org moves. After enforcement, requests to old instance URLs will fail—potentially breaking critical integrations silently.
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