Hi @ah8, welcome to this forum
Install /e/OS on a Fairphone FP2 - “FP2” from /e/ documentation describe a “new” method that is specific for this device, and look very simple and clear with only a few operations.
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Installing /e/ on the FP2 - Guides - Fairphone Community Forum look outdated as the file now foundable on the linked /e/ server (IMG-e-2.2-r-20240719418592-dev-FP2.zip) is designed to work using fastboot or Git Bash.
if you want to follow the “traditional way” described in this guide, like in Install LineageOS on FP2 | LineageOS Wiki or in [HOWTO] an Unified Install Guide Project for /e/, you need to use twrp-3.3.1-1-FP2.img, and e-2.2-r-20240719418592-dev-FP2.zip, that is designed to work using recovery.