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Those message don’t states that your subscription is the issue, your digital signature certificate validity date is different than your subscription, it is then possible to have those message with an active subscription.
Warning: Saving a copy of your digital signature (.epf file) on multiple computers can be risky since it will be updated on one computer only (not necessarily the main one that you use). As a result, it may no longer function on your other computers unless the updated file is copied manually on all of them following an update.