I'm at UB. One in Singapore https://t.co/xNNQ07V1BQ
Central Region
[{'url': 'https://t.co/xNNQ07V1BQ', 'expanded_url': 'https://www.swarmapp.com/c/aTJ4xwtY5Eq', 'display_url': 'swarmapp.com/c/aTJ4xwtY5Eq', 'indices': [28, 51]}]
KAMPONG UBI
["i'm", 'ub', 'one', 'singapore', 'https://t.co/xnnq07v1bq']
[]
ub 1 singapore
  [
    {"relatedness": False, "type": "none", "explanation": "This is not related to public housing or maintenance report feedback."},
    ]

It seems that the tweet "ub 1 singapore" does not relate to a maintenance report feedback to public flat house in Singapore. The term "ub" is not a common term used in Singapore's public housing context, and "singapore" is not a specific block or street. Therefore, the tweet does not match any of the categories I have identified.