@Justinq I am assuming you have two EAP225 Outdoor. If you have indoor you will need more equipment than stated.

I don't think the EAP225 support any type of bridging or repeater mode, which it appears you are attempting to accomplish. You could use a CPE 210 or 510 to connect in client mode to your EAP225 #1. 

NOTE: The CPE210 connects on 2.4ghz and the CPE510 connects on 5ghz. They are both limited to 100Mbps by the POE Port but that should be plenty for Starlink and you should be able to practically get full performance to the router in the garage. If you went this route, whichever CPE you chose would connect to your garage router WAN port and then connect in client mode to EAP225 #1. 

EAP225 #2 may not even be necessary. It would depend on the signal strenght of EAP225 #1 outside your garage.

  @Justinq 

Wireless Mesh would likely be my first recommendation, especially as its such a short distance.    For that however you would need some more hardware

EAP225 Outdoors, or newer 610 outdoors if you want (1x possibly 2x)

OC200 Controller (1x)

Providing this is possible for you, mount one of the EAP225 outdoors and cable through the wall into your house router.   Setup the OC200 and adopt the House based APs (225 and outdoor).   Enable MESH under advanced settings

Now the SSID you set on your OC200 should be broadcasting externally via the House Outdoor 225, see if your EAP225 in the garage can Mesh with this and if so ADOPT and go..  

If not you could set another EAP225 outdoors on the Garage wall, Mesh it to the House 225 outdoors, cable into the garage or mesh the Garage Indoor 225...  

This might give you more info

https://www.tp-link.com/us/support/faq/2949/

  @RickJamesBish 

Looks like James beat me too it... 

However you dont need a CPE as its such a short distance and MESH of the two 225 outdoors will suffice.

CPE is for 100s of meters of distance

  @Justinq 

Philbert is correct that the CPE is not necessary so I am not arguing his point, just basing my choice off my experience with Omada MESS ;) , which I like to call it. I have never been impressed with speeds that Omada MESH delivers. It does not come close to the speeds I get with CPE to AP at 100 feet. With Starlink though it will be overkill since your bandwidth will likely not exceed what the MESH can deliver.

Not sure about the two outdoor EAP225, each wired to a router though. Anytime I did this, they both show up as WIRED, and therefore could not MESH. Its very possible I was doing something wrong though because I do something wrong daily.

  @Justinq 

This is basically what you are after here

The OC200 is needed to control the MESH and manage the APs.   You may not need the 225 Outdoor marked in RED IF the existing 225 in the garage can get a strong enough signal from the new 225 outdoor on the house, as its only now 1 wall it may be possible.  If not get the RED one and cable it into the existing in garage.

The only AP in Mesh will be the RED one (or Existing 225 in garage if you skip the red one).  Basically the mesh is a wireless cable between the buildings.  

This should get you 5ghz speeds all over due to the small distances involved, its also quite easy to setup. 

When you setup the OC200 it will only see the house based APs via cable, get them adopted and then enable MESH.   Power on the Garage Outdoor and it should appear for adoption via MESH.  Do that then power on the existing garage 225 and it should also appear, adopt it and job done.