Yes, the DJI Osmo Pocket 3 is compatible with the SanDisk Extreme microSDXC UHS-I 128GB.
DJI Osmo Pocket 3 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 Pocket 3'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 SanDisk Extreme Pro 32GB V30 A1 UHS-I Speed Grade 3 Kingston Canvas Go!Plus 64GB UHS-I Speed Grade 3 Kingston Canvas Go!Plus 128GB UHS-I Spe”
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Confidence: high confidence