MIFARE cards need a MIFARE-capable reader. A 125 kHz prox reader will not read them.
Confirm the MIFARE type listed on the Transmitter Solutions card and reader.
MIFARE
A 13.56 MHz smart-card family used on many access readers.
Also called
MIFARE card13.56 MHz smart cardMIFAREMifarecode type MIFAREcode type mifaremifare credentials
Catalog fields
Credential FormatSupported Card Types
Source: Transmitter Solutions product training