I'm in the same situation. My matrica has been expired for years and my stupid passport expired LAST MONTH!

Appts for matriculas start in Sept so I made mine for Sept 12th. Appts for passports start in October. I'll have to go twice but at least I'll have my matricula soon.

I'm still sending my info w copies of the expired matricula and passport. If they want one that's. It expired I'll be able to provide it next month