IPN notifications stuck in queue in Sandbox

[WeAreCore]

We are experiencing an issue where IPN notifications are not being sent and are stuck with 'queued' status.  From looking through historic community posts it looks like this is a recurring issue.

Our sandbox merchant ID is NEZ6LQSRUEW32

Please could we have some advice on how to resolve please? 

[MTS_Justin]

Hello,

Apologies for the delay in responding, I was out of office for a few weeks.

Thanks for sharing the merchant id for your sandbox account. I've checked the account today and all IPN's show as having a "sent" status.

Please let us know if the issue reoccurs.

Thanks !