Yes, the DJI Osmo Action 6 is compatible with the SanDisk Extreme microSDXC UHS-I 128GB.
DJI Osmo Action 6 has a microSD-only card slot. SanDisk Extreme microSDXC UHS-I 128GB fits directly, no adapter needed, and independently clears the speed-class requirement (DJI Osmo Action 6's own page states the floor) -- not the exact named SKU on every platform's own recommended-card list, but the same certified speed class.
“Card Type: microSD card (up to 1 TB) Recommend MicroSD Card Lexar Professional SILVER PLUS 64GB U3 A2 V30 microSDXC Lexar Professional SILVER PLUS 128GB U3 A2 V30 microSDXC Lexar Professional SILVER P”
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Confidence: high confidence