No, the Lexar CFexpress Type B Professional Gold 128GB is not compatible with the Sony A7 IV.
Lexar CFexpress Type B card cannot fit the Sony A7 IV's Type A slot. CFexpress Type A and Type B are different physical connectors and pin counts.
What works instead
See all compatible memory card for the Lexar CFexpress Type B Professional Gold 128GB →“This camera supports CFexpress Type A memory cards and SD memory cards”
Last verified:
Confidence: inferred