HSBC Holdings Plc’s mobile banking app experienced an outage on Monday morning, leaving customers unable to access their accounts in what marked the lender’s second disruption this year, according to Bloomberg. 

Serving more than 7 million retail customers, the bank said its app service was “temporarily unavailable” and said it would resume shortly. Users attempting to log in were met with error messages including “We couldn’t log you on” and “Access is restricted until we have your valid email address and mobile number.”

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By late morning Monday, some customers were able to log onto the app again. This marks the second time this year that HSBC’s mobile banking service in Hong Kong has encountered problems, following a disruption in late January, according to Bloomberg.

As the city’s largest bank, HSBC offers a wide range of products spanning transaction banking, lending, wealth management and insurance. Earlier this year, it completed the full acquisition of its subsidiary Hang Seng Bank in a deal valued at about $14 billion.

Hang Seng Bank also said due to a technical issue, some of its banking services were temporarily affected.