Can not export my contacts from I cloud

As per this article https://support.apple.com/en-in/guide/contacts/adrbk1512/mac

vCard Format

Select the format to use for vCards. The default format is 3.0.

Make default format in contact application so that you can export contacts from iCloud.com https://support.apple.com/en-in/guide/icloud/mmfba748b2/icloud

Note : make sure in system preferences > iCloud the apple id is signed and configured with iCloud.com , the contacts box must be checked .

you can create a new test user account and check the behaviour of contact application , https://support.apple.com/en-in/HT204443

Please mention the version of Mac .

Try exporting in another format.