My cloud home cannot open Microsoft office

Hi,
I have purchased My cloud home 6TB in March 2021 mainly for work. It works fine so far (only when I have to save files from word to PDF, it took ages). Until early August 2021 I cannot open Word, Excel, Powerpoint that I save in My cloud drive anymore. The box keeps pop up and say " Access denied. contact Administrator."
But all files that I save on my desktop can open MS as usual.
I have to copy the file from My cloud to my desktop then I be able to open the file. That’s so annoying that it doesn’t do the job properly. (only photo, VDO and PDF can open the file)
Does anyone experience similarly?
How did you fix this problem?

Hi,

We regret to inform you that Microsoft Online Account, Office 365, and OneDrive for Business are not supported with My Cloud Home

Please refer the following link for more information: My Cloud Home: 3rd Party App OneDrive Login Message "Microsoft account doesn't exist"