Hello I am having a starting issue might be a.

Your battery is not okay. A fully-charged battery will measure 12.6 volts. A good but discharged battery will read 12.2 volts. You're below that indicating it has a shorted cell or it is really discharged. You can try charging it at a slow rate for an hour to see if the voltage comes up. If it does, measure the battery voltage again once the engine is running. It must be between 13.75 and 14.75 volts. If it is low, have the charging system diagnosed.

There's still some confusion about battery voltages. If that 12.8 volts was with the charger connected and turned on, that's not enough. You need a minimum of 13.75 to get the current to flow through the acid in the battery. 12.2 volts off the charger indicates the battery is discharged. Computers do weird things when the supply voltage is low. Some functions may work and others may not.

The alternator has nothing to do with this problem, at least up to this point. It's job is to recharge the battery after it has cranked the engine, and to supply all the current for the entire electrical system, but only once the engine is running. This problem is related to a defective battery or one that has been severely discharged. When a good battery becomes this badly discharged to reach 11.9 volts, it will take a good ten to 15 minutes on a charger before it starts to take a charge. It takes that long for the acid to fill with electrons and become conductive. As that happens, charging current will gradually increase from near 0 amps to no more than 20 amps to prevent overheating the battery. Once it is fully-charged, the current from the charger will slowly drop to around five amps. It can be considered fully-charged at that point as current will not drop much lower.