PIE h2ei- h1ai- h4ei- 'to take/to give'

I'm confused about different reconstruction of this PIE root

Beekes h2ei- Grk. ainumai
(by the way the Greek verb is with long or with short u:?)

LIV reconstructs h1ai- (Grk, Hittite pa:i/pianzi etc...)

Adams for Tocharian reconstruct h4ei-

Any help?

Thanks,
Marius