Yes, the Canon EOS R5 Mark II is compatible with the Kingston Canvas Go! Plus microSDXC 128GB.
This is a microSD card — it needs its bundled microSD-to-SD adapter to physically fit Canon EOS R5 Mark II's SD slot (Slot 2) at all. Even adapted, Kingston Canvas Go! Plus microSDXC 128GB is V30-rated (equivalent to the UHS Speed Class 3 / U3 floor), clearing only the camera's lowest Long-GOP tier (basic 4K/SRAW at 29.97fps and below, plus FHD) — it never reaches the V60 floor for higher-framerate 4K Long-GOP or the V90 floor for 8K Long-GOP, and no setting or firmware update changes a card's rated speed class. Also, its own card-performance-requirements table shows every RAW, SRAW, and Intra-codec recording mode (XF-HEVC S / XF-AVC S High Quality Intra, Standard Intra, Light Intra) has no SD-card entry at all — those modes are CFexpress-only by design, not just speed-limited. Only Long-GOP (LGOP) compressed modes are SD-eligible.
Limitation
Cannot record 8K Long-GOP (V90), higher-framerate 4K Long-GOP above 29.97fps (V60), or any RAW/SRAW/Intra-codec mode (CFexpress Type B, VPG400 only) on the SD slot. Works for basic 4K/SRAW Long-GOP at 29.97fps and below, and FHD.
“Standard LGOP 29.97 CFexpress 2.0 U3 25.00”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)