Hello nikolaosp26877879
We apologize for the inconvenience caused, as per the description above, you are not able to use the service of Adobe ExportPDF, Is that correct?
The record shows that you are subscribed to Adobe ExportPDF on your current Adobe ID, you can access the service through the URL https://cloud.acrobat.com/exportpdf with your Adobe ID and password on a different browser like Chrome or Firefox, or Safari.
You can also use the free desktop version of Adobe Reader DC to use the service of Adobe ExportPDF, just "sign-in" with your current Adobe ID and password in Adobe Reader DC, download Adobe Reader DC from Adobe - Adobe Acrobat Reader DC Distribution
if you still wish to discontinue the subscription, you can refer to Cancel your membership or subscription | Adobe Acrobat, Document Cloud PDF services
You can also contact the Adobe support team through https://helpx.adobe.com/contact.html
Feel free to update this discussion in case you need further assistance.
Regards,
Anand Sri.