Yes, the Nikon Z8 works with the SanDisk Extreme microSDXC UHS-I 128GB — with conditions (see below).
Nikon Z8 has a full-size SD card slot. SanDisk Extreme microSDXC UHS-I 128GB (real write speed 130 MB/s) fits via the bundled microSD-to-SD adapter and clears this camera's standard/base recording modes (UHS Speed Class 3), but does not reach the ~250 MB/s sustained write speed this camera's manual recommends for its high frame-size/rate video modes -- those modes are CFexpress-recommended anyway.
Conditions for compatibility
requires the bundled microSD-to-SD adapter (included with the card); clears standard/base recording modes only, not this camera's high-frame-size/rate modes (~250 MB/s recommended, CFexpress territory).
“CFexpress or XQD cards with a maximum data transfer rate of at least 45 MB/s (300×), or UHS Speed Class 3 or better SD cards, are recommended for video recording and playback. CFexpress or XQD cards with a maximum data transfer rate of at least 250 MB/s, or UHS Speed Class 3 or better SD cards with a maximum data transfer rate of at least 250 MB/s, are recommended for recording and playback of videos with a high frame size or rate.”
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