I’m having an issue which may be a bug.
A conference room which has been running for a couple of years now says invalid pin.
We removed the pin (blank), put it back, same result.
Put a 6 digit pin instead of 4 digit pin, same result.
Removed the conference configuration, reconfigured it, same result.
Uninstalled conferences, re-installed conferences, configured the conference, same result.
New discovery: If we call from another FreePBX box to the conference, OR if the people on the same PBX call into the conference DID, the PIN fails, if they call from a land line or cell phone it works. This definitely worked before from other FreePBX because thats how we setup and test them.