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Issues with Publishing Heroku AppLink Applications on Salesforce Sandboxes In the case of creating a new Salesforce sandbox org from an org that has a functional Heroku AppLink setup, you may hit an issue where partial configuration is copied from the parent org to the sandbox and leaves the sandbox in a broken state. This state can cause issues when trying to publish the Heroku AppLink application(s) into the sandbox, even if the connection between the organization and Heroku AppLink is working. While work is being done by Engineering to address this, we do have the following workaround that should get you back up-and-running with your AppLink-related work.
IP Address Allowlisting for your Salesforce Org when using Heroku AppLink Should you be utilizing Heroku AppLink, it is necessary to allowlist the following IP addresses to facilitate token management for authorization and connections. Failure to do so may result in authorization failures, accompanied by an "IP restricted" error description.
Syncing Heroku Postgres data to Salesforce via Heroku Connect is slow Your connection has a high number pending writes to be synced to Salesforce via Heroku Connect and sync is processing very slowly.
Heroku local doesn't work with my php app on Windows `heroku local` doesn't work with my PHP app on Windows.
Can I use unlogged tables on Heroku Postgres? You would like to use unlogged tables on Heroku Postgres.
How can I provide access to an existing Heroku Connect add-on to a new user on the application? I'm unable to see the Heroku Connect connections and mappings.
How do I change the dyno plan used by Heroku Scheduler? I'm running tasks on Heroku Scheduler but I don't know how to change the dyno plan used to run the tasks.
Why am I seeing `certs:auto:disable is not a heroku command.`? When trying to disable Automatic Certificate Management (ACM) with `heroku certs:auto:disable` I see the error `certs:auto:disable is not a heroku command.`
How do I find out when a Heroku SSL (SNI) endpoint was created or last updated? You want to see when changes to a Heroku SSL endpoint took place.
Heroku Connect: Custom Metadata Types Support Does Heroku Connect support Salesforce Custom Metadata Types (`__mdt`)?

Dev Center articles 3

Invoking Heroku AppLink Apps Different options for invoking your published apps with Heroku AppLink.
Salesforce Functions Retirement Salesforce Functions is retiring and there's a timeline for the process before it reaches end-of-life. For customers who want to keep their functions functionality, there's the option to migrate to Heroku.
JWT Authorizations with Heroku AppLink Authorize AppLink users for headless authentication in CI/CD pipelines and automated workflows.

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