The governments coronavirus contact tracing site crashed upon its launch on Thursday and it has been branded a “complete shambles.”
Doctors reported major teething problems and some staff were not provided with passwords to start work.
Government ministers have been warned that due to their own guidance two million people could be in isolation at any one time.
The Health Secretary Matt Hancock has told the public they must do their duty to self-isolate if “ordered” too and threatened to introduce fines, if they do not obey orders from the test and trace.
Hancock said that self-isolation will be “voluntary at first” and he could “quickly make it mandatory if that is what it takes.”
He said during the daily Downing Street press conference, “If you are contacted by NHS Test and Trace instructing you to isolate, you must.
“It is your civic duty, so you avoid unknowingly spreading the virus and you help to break the chain of transmission.”
He added, “new way of life’ as he announced anyone with symptoms can now access a check.
“As we move to the next stage of our fight against coronavirus, we will be able to replace national lockdowns with individual isolation and, if necessary, local action where there are outbreaks.
“NHS Test and Trace will be vital to stopping the spread of the virus. It is how we will be able to protect our friends and family from infection, and protect our NHS.
“This new system will help us keep this virus under control while carefully and safely lifting the lockdown nationally.”
Dido Harding the chief executive of NHS Test and Trace, said the success of the test and trace scheme will depend on people doing as they are told when it comes to the 14-day self-isolation.
She told reporters on Wednesday, “The purpose of this is to enable us to move from all of us being in national lockdown to a model where there is individual isolation if you are ill with the disease or if you have been in close contact with someone who is ill with the disease and local action where we see individual cases starting to spike.
“So, it is a really important moment where all of us in the country will need to play our part in enabling us to be able to move back to a more normal life.”
She added, “The Secretary of State has the powers to bring in penalties but on day one that is not what we are doing.”