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You need to connect Dropbox to your account again.

When you create a new backup profile — generally: if you want to use the same Dropbox account on a different backup profile or site — do NOT copy the access and refresh tokens; this will break all backup profiles except for the first one to take a backup after this change. You need to relink Dropbox.

When you copy or import backup profiles you are essentially creating copies. Therefore you need to relink Dropbox to that profile.

Relinking Dropbox does not remove the previous link. It simply creates a new (ephemeral; 1 hour lifetime) Access Token and a (persistent) Refresh Token. When the Access Token expires, Akeeba Backup uses the Refresh Token to get a new access token.

Finally, please keep in mind that unlinking the entire Akeeba Backup application from Dropbox (in your Dropbox account's settings) breaks the connection for all sites and backup profiles which were using this Dropbox account. Unlinking the application in Dropbox' settings is the last resort, as it requires a lot of effort on your part to recover from its effects.

I hope this helps!

I see that the log file says that you have the exact same issue. However, when I try backing up to Dropbox with a backup profile which definitely has an expired access token I do not have the same issue. Akeeba Backup does see the expired token, gets a new one using the Refresh Token and the Download ID using our mediation service, and uses the new access token to complete the upload.

So, let's check everything from the top.

1. Have you relinked Dropbox on Profile #4? Remember that all settings, including the Dropbox configuration is per backup profile. If you only relinked profile #1 it will have no effect on profile #4. Go to Components, Akeeba Backup. Select profile #4 from the dropdown; the page reloads. Now click on Configuration. Relink Dropbox.
2. Have you entered your Download ID in Akeeba Backup? You can find your Download IDs after logging into our site by going to Add-on Download IDs. You enter the Download ID in the component's Options page. This is necessary because using Dropbox requires access to the authentication mediation service running on our server. Using that service requires a valid Download ID belonging to a user account that has an active subscription to one or more of our backup products. Do not paste your Download ID in your reply, this is a public ticket.
3. Is the Download ID correct? As per above. Please double check and confirm that the Download ID you have entered matches one of the Download IDs in the Add-on Download IDs page on our site. Do not paste your Download ID in your reply, this is a public ticket.