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'Send with DocuSign' raises 'Page doesn't exist' after sandbox switch

  • February 13, 2026
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Hi all, we had DocuSign Apps Launcher working on our test Salesforce sandbox. I’ve migrated to the User Acceptance Testing sandbox and am getting a ‘Page doesn’t exist - Enter a valid URL and try again’ when we click the ‘Send with DocuSign’.

I’ve set up a new template on the UAT sandbox and that’s working, there’s a corresponding IK on my Apps & keys dashboard, so it’s connected to my dev account.

The button is calling:

{!URLFOR($Site.BaseUrl + '/apex/dfsle__sending', null, [sId = Farm_Visit__c.Id])}

I’ve tried swapping out the /apex/… with endpoints for REST & SOAP to no effect. I wasn’t really expecting that to work but /apex/ isn’t listed on the endpoint page listing so figured it was worth 30 seconds to cut’n’paste.

I'm assuming that $Site.BaseUrl is correct (https://demo.docusign.net but I don’t know how to check that from Salesforce. That is what is set on my dev account API & Keys dashboard.

I’ve checked the API reporting and there are no failed API calls logged on docusign-d

I’ve un-installed DAL and reconnected it to no effect.

I’ve gone back and reinstalled DAL on the test sandbox and it’s working as expected. So it feels like somethings getting mixed up between the two, but I’m not sure what/where.

I guess I could try setting up a new dev account, but starting to run out of ‘obvious’ options.