Link in Email Not Working - Not Available!

An invoice that has been emailed to a client, and now we’ve emailed one to ourselves to test it as well, is not working. The link within it says that it’s not available. This the second time we’ve emailed this to the client and the first one, he said the link worked but then it wouldn’t process his payment. We did have to upgrade our Stripe gateway, but I updated the API keys now to the newest ones so it should be working.
can you please look into this and have it resolved soon? Thank you so much!

As mentioned in our email, the most likely cause for the message is the invoice is deleted. Note, you’d also see this message if the client or contact is deleted.