Simple Signature · Troubleshooting
Authorize does not work
What to check, and how to fix it.
Last updated 9 Oct 2026
What to do
First check three things. You work in Salesforce Classic. You clicked Save Settings just before. Your user has Simple Signature (Admin). Then find what you see below.
| What you see | What to do |
|---|---|
| login.salesforce.com refused to connect | You are in Lightning. Switch to Salesforce Classic. Click Authorize again. |
| Invalid Code Verifier | Click Save Settings on the Site Configuration tab. Then click Authorize again, in Classic. |
| A blank page after you sign in, and no date above the button | Make a new External Client App. Paste its key and secret. Click Save Settings. Click Authorize again. |
| Salesforce logs you out | Log out of Salesforce. A reload is not enough. Log in again as the admin. Click Authorize again. |
| Nothing happens | Click Authorize a second time. |
| You cannot untick PKCE | Leave it ticked. Simple Signature works with it. |
Applies to
Simple Signature 5.8.x. This fix comes from the tested Simple Signature implementation guide.
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Related
- All Simple Signature troubleshooting
- Install the newest version of Simple Signature. TAF works on bugs in the newest version only.
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