Yes, the Canon EOS R6 Mark II is compatible with the SanDisk Extreme microSDXC UHS-I 128GB.
SanDisk Extreme microSDXC UHS-I 128GB is V30 class. Meets the floor for: 4K30 (30 MB/s floor). Does not meet the floor for: 4K60 (60 MB/s floor). (Peak write 130 MB/s is not evidence of sustained performance; the V30 class rating above decides this.)
Limitation
Cannot record 4K60 in 10-bit or Canon Log 3 -- requires Video Speed Class V60, this card is V30 class. The bundled microSD adapter provides physical fit only; it does not change the card's class rating. Works for 4K60 8-bit (needs UHS Speed Class 3, met) and all 4K30 modes.
“Q) 4K UHD 4K UHD cropped 59.94 fps 50.00 fps IPB (Standard) UHS Speed Class 3 or higher Video Speed Class V60 or higher IPB (Light) UHS Speed Class 3 or higher 29.97 fps 25.00 fps 23.98 fps IPB (Stand”
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High confidence