BMO Harris Bank is having technical difficulty with the rollout of its new mobile banking app, which is part of a digital revamp of Bank of Montreal’s U.S. operations.

A January 16 tweet announcing “new digital enhancements to online and mobile banking” was followed by a slew of customer complaints that spilled over into subsequent tweets from the Chicago-headquartered bank this week.

We’re excited to introduce new digital enhancements to online and mobile banking for BMO Harris customers. We’d encourage you to complete online transactions by Friday as access may be unavailable this weekend. To learn more, please DM us or visit: https://t.co/AE0IfHB3le

— BMO U.S. (@BMO_US) January 16, 2019

Complaints just in the bank’s Twitter replies over the past week indicate hundreds of customers have had trouble logging on to BMO Harris’s online and/or mobile platforms, followed by difficulty reaching the bank’s customer service team. Some customers expressed dissatisfaction with the lack of a timeline from the bank for when the issues would be resolved, and with the prospect of having to download a new app once it’s available.

One customer asked where an online feature allowing users to create categories for transactions went. “That was extremely useful and am a bit annoyed that it’s gone,” the customer tweeted. The bank replied the feature is “no longer available” on the online banking platform but that it does “offer the option to download your activity off-site in order to manage/categorize your transactions.”

https://twitter.com/holli_hartman/status/1087329403804286976

In a tweet on Thursday, the bank acknowledged there were still customers experiencing difficulty. Replies indicated at least some customers had gone a week without being able to access their accounts and they have bills due.

One customer replied they talked with a personal banker at BMO Harris who said the bank was still working out the kinks. “They said to wait another week!” the customer tweeted. “OMG. So don’t bother calling and holding for an hour. It’s useless.”

Met with personal banker at BMO. They said still trying to work out the kinks for digital banking. They said to wait another week! OMG. So don’t bother calling and holding for an hour. It’s useless.

— Dr. Choe (@mmachiro) January 24, 2019

A spokesman for BMO Harris told Bank Innovation in a statement:

“We’ve made recent enhancements to our digital banking services and we are aware that a very small percentage of our customers are experiencing trouble accessing the new services. We have teams of employees dedicated to getting this fixed as soon as possible. We are very sorry for the inconvenience, and we remind customers that they can access BMO ATMs and visit their nearest branch to conduct their banking.”

Bank of Montreal CEO Darryl White in December said “nearly 1 million” U.S. segment customers would be using the enhanced digital banking platform “within the next couple of months.” The bank’s strategic priorities include “drive leading growth in priority areas by earning customer loyalty” and “harness the power of digital and data to grow,” according to its 4Q18 earnings presentation.

The U.S. segment accounted for 28% of Bank of Montreal’s adjusted earnings in 2018, up from 24% in 2017, the same presentation showed.