Yes, the Kingston Canvas Go! Plus microSDXC 128GB is compatible with the Sony A7 IV.
Sony A7 IV has a full-size SD card slot. Kingston Canvas Go! Plus microSDXC 128GB (real write speed 90 MB/s, V30 class) fits via the bundled microSD-to-SD adapter and clears XAVC HS/S 4K recording (V30 required, met exactly), but does not meet the Video Speed Class 90 floor this camera's XAVC S-I 4K mode requires.
Limitation
Cannot record XAVC S-I 4K (intra-frame) -- requires Video Speed Class V90 per Sony's own spec, this card is V30. Works for XAVC HS/S 4K (V30 required, met exactly) via the SD slot. The bundled microSD adapter provides physical fit only; it does not change the card's class rating.
“aximum recordable bit rate Supported memory card XAVC HS 4K 200Mbps CFexpress Type A memory card SDHC/SDXC card (U3/V30 or higher) * XAVC S 4K 200Mbps CFexpress Type A memory card SDHC/SDXC card (U3/V”
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High confidence