Problem 1
designmynight/laravel-mongodb-passport v1.2.7 requires jenssegers/mongodb 3.3.* || 3.4.* || 3.5.* -> satisfiable by jenssegers/mongodb[v3.3.0, v3.3.0-alpha, v3.3.1, v3.4.0, v3.4.1, v3.4.2, v3.4.3, v3.4.4, v3.4.5, v3.4.6, v3.5.0, v3.5.1, v3.5.2, v3.5.3] but these conflict with your requirements or minimum-stability.
"php": "^7.2",
"fideloper/proxy": "^4.0",
"jenssegers/mongodb": "^3.6",
"laravel/framework": "^6.2",
"laravel/tinker": "^2.0",
"league/fractal": "^0.18.0",
"prettus/l5-repository": "^2.6",
"robclancy/presenter": "^1.4"
}