A pending message status on Snapchat may result from deactivating or deleting a user’s account. Unless they want to reactivate the account, there isn’t much you can do to message them in this situation. Read more what does pending mean on snapchat
message was lost
After 30 days, Snapchat automatically deletes all unseen Snaps. A Snap you sent to a friend can show up on Snapchat as “Pending” if they haven’t opened it in a month. If the message is crucial, you can decide to resend it at this point.
In some circumstances, a Snapchat issue or glitch could potentially cause the message to appear as pending. You should confirm that the app is operating as intended in order to resolve this issue. Try texting them after updating the app or emptying the app’s cache as a starting point. Don’t forget to check at our comprehensive guide to fixing common Snapchat issues.
The message was misplaced
Snapchat automatically deletes all unseen Snaps after 30 days. If a Snap you send to a friend hasn’t been opened in a month, it will appear as “Pending” on Snapchat. If the communication is critical, you might choose to resend it now. The Snap Incident
In rare cases, a Snapchat problem or bug may cause the message to appear as pending. To remedy this issue, you must first ensure that the app is functioning properly. As a starting point, try messaging them after upgrading the app or deleting the app’s cache. Don’t forget to read our detailed guide on resolving common Snapchat difficulties.