Hello Eddie,
in cisco CCW tool it suggests a feature license for this linecard
20G Upgrade License on A9K-4T16GE-TR Packet Transport
So it might also be a licensing issue,
I am looking for the linecard datasheet. I will edit this post if I find other info.
Edit:
ASR 9000 linecard family types
First generation ethernet linecards
Edit2:
your linecard is a second generation linecard TYphoon based optimized for Transport the final TR.
According to the datasheet these linecards can be installed in the following chassis:
Chassis compatibility
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● Cisco ASR 9904, ASR 9006, ASR 9010, ASR 9912, and ASR 9922 routers
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Note:
4T16GE - 4 ports of 10 Gigabit Ethernet and 16 ports of 1 Gigabit Ethernet per line card; comes in a default 40 Gigabit capacity combo mode of 2 x 10 Gigabit Ethernet + 16 x 1 Gigabit Ethernet, which can be changed to 4 x 10 Gigabit Ethernet through the command-line interface (CLI) and upgraded to full capacity of 4 x 10 Gigabit Ethernet + 16 x 1 Gigabit Ethernet through a license
This license should be the one suggested by CCW tool.
I couldn't find the minimum IOS XR version to support it.
Hope to help
Giuseppe