Problems with notifications to posts subscribers on TYPO3 12

[srchild]

On TYPO3 13 with t3extblog 9.0 posts notifications are working immediately after install (after including TypoScript and setting constants, and subscribing an email address).

On TYPO3 12.4.31 and 12.4.32, with t3extblog 8.0.2, it doesn't work. The backend button to send emails doesn't show.

Am I missing some configuration, or does it not work in 12.4.32/8.0.2

Thanks