The question why didn’t the Apostles and early church obey Jesus and baptize according to Matt. 28:19 is founded on two main false premises.
1. The text is Trinitarian.
But, most Trinitarians would not say “the Father, the Son and the Holy Spirit” is the literal “name” for the Trinity.
2. Eusebius only quotes the short form “in my name”.
But, Eusebius quotes both forms before and even after Nicaea!
For more see: https://thehumanjesus.org/2022/04/05/matt-2819-is-neither-a-trinitarian-formula-nor-a-corruption/
1. The text is Trinitarian.
But, most Trinitarians would not say “the Father, the Son and the Holy Spirit” is the literal “name” for the Trinity.
2. Eusebius only quotes the short form “in my name”.
But, Eusebius quotes both forms before and even after Nicaea!
For more see: https://thehumanjesus.org/2022/04/05/matt-2819-is-neither-a-trinitarian-formula-nor-a-corruption/