There are instances where social media channels return error messages.
Please review the error message so you can better understand why the post failed and how you can resolve the error.
Here are some general troubleshooting tips by channel:
Go to Manage Social Accounts to disconnect, reconnect, and connect Social Accounts.
You can also view any Social Account requires attention due to failures or expiration from here.
Error code HTTP 500
error 500 is an exceptional error coming from the social network's API.
You should be able to try publishing the post again using the "Update Post & Reschedule" feature.
Our suggestion would be to manually publish the post and then mark the post as published in Loomly. Otherwise, you can try rescheduling the post later to see if it successfully publishes as this is a temporary error.