FP6 not being detected by fastboot - can't install /e/OS

according to https://support.fairphone.com/hc/en-us/articles/18896094650513-How-to-manually-install-Android-on-your-Fairphone#01HB8ZZ1BMMQNSNMFT3YXDBXA0

[Current] FP6.QREL.15.162.0.20251121144015_VS1V-factory.zip

Version: FP6.QREL.15.162.0
Release Date: 15 December 2025
Security Patch: 05 November 2025

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:warning: Security fixes

This /e/OS 3.4 version includes all Android security patches available as of January, 1st.

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what is the “allow OEM unlock” button status in Developer Options ?