Good question as I've only just caught up with this but see nothing here.

Risks in the north of Cameroon (Boko Haram) are well known and still there afaik, but the Anglophone portion of Cameroon (formerly Southern Cameroons Brit colony) has risen against the dominant Francophone government and is seeking independence. Oddly enough it's right next to Biafra which people my age will remember well.
Wiki call it the Anglophone Crisis
Elsewhere it's the Ambazonia War.

This has affected overlanders as the once notoriously muddy but lately sealed Ikom–Ekok crossing leads into the heart of the conflict zone and has become closed to foreigners. Cameroonian consulates (in Nigeria: Lagos, Abuja, Calabar) may make you sign an affidavit promising you won't use this crossing.

In Calabar they may also insist you've bought a ferry ticket to Limbe or Tiko before they issue a visa.
The boat takes ~15 hours and will cost about $450 with a bike. It's 55km from Toko to Douala.
Leaves when full or twice week?

The only alternative is the overland crossing 700km to the north (but not too far north) between Gembu and Banyo. Same distance from Abuja.
It's unsealed and so presumably dry season only (if there is such a thing there).

From Banyo it's about 500km to Douala or Yaounde for more visas.

Happy to be corrected.

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Morocco Overland 4 (2025) • Trans Morocco Trail