I just updated the provisional certificate and had to update ionic package certificate accordingly. I don’t do that often so I ended uploading the .cer file instead of the .p12 as remarked above. That solved my problem BUT I strongly suggest to edit ionic.io UI to give this simple hint when receiving the certificate.
The text on the popup to upload the certificate says something like “Development / Appstore Certificate [upload button] Provisioning profile [upload button]”. I fell for the first input and thought it had to be the .cer file. So, specifying “Development / Appstore Certirficate (p12 file)” would have saved us all the time.
Regards!!