If you have not yet read this blog entry, do so now:
https://dalehusband.com/2018/06/07/the-bogus-issue-of-infallibility-in-the-bahai-faith/
Abdu’l-Baha’s claim of infalliblity was directly opposed by his brother Mirza Muhammad Ali, resulting in the latter being declared a violator of Baha’u’llah’s Covenant, which was an outright lie. You don’t violate a covenant by upholding the actual teachings of Baha’u’llah!
Dale Husband's Intellectual Rants 