Voice Mail notification no going off

Weird issue. 6P, completely stock, unrooted. Just got the Nougat OTA upgrade. All went well. Got a call & it went to voicemail. Got the voicemail, deleted the message & logged off the voicemail system. But the voicemail notification is still there. Reboots & 'checking' voicemail again don't seem to remove the notification. Anyone have any ideas?

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