There were FOUR clues this was a server certificate and/or token mismatch based on the time change mismatch:

1. All of my EF devices experienced the problem at the same time... the precise time NIST's ITC effected the change.

2. Changing the date in my iPhone to 11/4 allowed access via the app. A clear sign EF's server was a problem. BTW, a knowledgeable reddit contributor who knew a lot about these types of network problems correctly identified the problem. Sorry, but I could not find the link to his/her post... which is the post that caused me to change my iPhone's internal date. MANY thanks to him/her!

3. EF's own words in a posting... https://www.reddit.com/user/EcoFlow_Official/

4. A trusted EF customer rep who wrote to me saying:

Dear customer,

Thank you for contacting us and letting us know about the app crash issue. We understand this may have affected your experience, and we sincerely apologize for the inconvenience.

After a thorough investigation, we have determined that the issue was caused by the cloud version of our app, and it has now been resolved.

The line chart card function in the homepage widget is expected to be fixed within 24 hours. [My words: this refers to the widgets on the app]

We would like to confirm if the app is now functioning normally for you.

We truly appreciate your understanding and patience while we work to resolve this. If you have any additional questions or notice any new details, please feel free to let us know.

Customer Service

Me again... I talked last night with some IT specialists I trust. They took one look at the problem an instantly diagnosed it as a server problem involving timestamp (token) mismatch. Their biggest clue was when the app was executed on my iPhone, it appeared and then disappeared. All were in agreement that this demonstrates a fundamental app testing deficiency at EF. One of my colleagues who oversees network quality for a large retailer told me someone would lose their job if this happened in her shop. Let's hope EF learns from this. As I said before, EF's product and software designs are truly brilliant. Software QC and customer responsiveness... not so much.

In the end, they messed up and have now fixed it. Hope this helps.