What specific MP of SE ST8 is supported in TCRS 11.3?
The latest Teamcenter release supported at the ST8 end of maintenance was: ST8MP12 and Teamcenter 11.2.3. So there is NO ST8MPx will supported in TCRS 11.3.
Solid Edge and Teamcenter Integration for Solid Edge compatibility and lifecycle information is maintained here.Solid Edge End of Maintenance Policy -- SFB-SE-9757
The latest revision of SFB-SE-9757 for Solid Edge & Teamcenter Integration End of Maintenance has been checked-in and released.
Recommend user for plan to upgrade to Solid Edge with latest released version; for now it's SE-ST10.
Note, Teamcenter delivered a regression in 11.3. Solid Edge ST10 (and ST9MP) require a minimum of 18.104.22.168 (which is covered in the SFB).
Hope this helps.
Notes and References
OS Version: 2012