The query_domains method from the FeatureLayerCollection class returns an error message, "The requested layer (layerId: queryDomains) was not found. (Error Code: 400)".

Workaround

Use the following script suggested in GitHub, refer to the following link, https://github.com/Esri/arcgis-python-api/issues/485#issuecomment-568037339

from arcgis.gis import GIS

gis = GIS("home")

def process_layers_or_tables(layer_or_table):

  print(f'{layer_or_table.properties.name}: {layer_or_table.url}')

  for field in layer_or_table.properties.fields:

    print(f'\t{field.name} - {field.alias} - {field.type}')

    if 'domain' in field and field.domain is not None:

      print(f'\t\tDomain associated with field')

      if field.domain.type == 'codedValue':

        for coded_value in field.domain.codedValues:

          print(f'\t\t\t{coded_value.name}')

      else:

        print(f'Not coded value domain: {field.domain}')

feature_layer = gis.content.get("7791c2d03a214eb8a767c9e58d2275a2")

for layer in feature_layer.layers:

  process_layers_or_tables(layer)

for table in feature_layer.tables:

  process_layers_or_tables(table)

Steps to Reproduce